Tool-holder for tool-grinding machines.



T. LUMSDEN.

TOOL HOLDER FOR TOOL GRINDING MACHINES.

APPLIUATION FILED APR. 6, 1914.

1,1 33,65 1 Patented Mar. 30, 1915.

2 SHEETS-SHEET 1.

THE MORRIS PETERS C0.. PHOTO-LITHG. WASHINGroN. D4 C.

T. LUMSDEN.

TOOL HOLDER FOR TOOL GRINDING MACHINES. APPLIoATIoN FILED Amm, 1914.

2 SHEETS-SHEET 2.

THE NORRS PHTES C0', PHOTO-LITHO WSUINQTUN. D. C.

pnrrnn srn'rns PATENT cierren.

THOMAS LUM'sDEiv, or GATESHEAD, ENGLAND.

Specification of Letters Patent. Patented K131i', 30, 1915.

Application filed April 6, 1914. Serial No. 829,794.

To cZZ whom it may concern e Be it known that I, THOMAS LUMSDEN, a

subject of the King of Great Britain and Ireland, residingat CoulthardsLane, East street, Gateshead, in the county of Durham,

England, have invented new,V and useful Improvements in Tool-Holders forTool-Grind- Y ing Machines, of which the following isla specification.

This invention relates to tool-holders for tool-grinding machines, andhas for its object to provide a simple, light and cheap construction oftool-holder capable of all the vnecessary adjustments for the efficientgrinding of machine tools andsimilar work.V A tool-holder in accordancewith this 1nvention comprises a lever carrying a toolbox or chuck andadapted to be reciprocated transversely.across the cutting edge or faceof the grinding disk or wheel, said tool-box or chuck being adapted tobe turnedy about either of two axes perpendicular to the plane in whichit and the lever are reciprocated to bring the tool to be ground up tothe cutting edge of the grinding disk or wheel and to vary the angle atwhich the tool is presented to the grinding disk or Y wheel.Supplementary means are provided for reciprocating the lever andtool-box or chuck to travel the tool to be ground transversely acrossthe cutting edge or faceof the Vgrinding disk or wheel, and means arealso provided for adjusting one of the axes about which said tool-box or'chuck turns toward and away from the cuttingedge or' Y faceof thegrinding disk or wheel.

` I will fully describe my invention with reference to the accompanyingdrawings wherein- Y.

Figure 1 is a plan ofone form of toolholder 4in accordance with myinvention;

` Fig. 2 is a Jfront elevation of Fig. l; Fig. 3

is a section on the line X--X in Fig. l; and Fig. .lis a section -of thetool-box or chuck. Figs. 5 and 6 are similar views to Figs. 1 and@respectively illustrating a modified form of the tool-holder; and Fig. 7is a part section of Fig. 5 yon the line Y--Y therein.

Referring to Figs. l to .4 of the drawings,V

I provide a lever a extending across the lfront of the grinding disk orwheel, the position of which is indicated by the dot-anddash lines b,and bearing on a iiXed plate or table c supported from the pan of thegrinding machine. The 4lever a is provided with a curved slide cl, and arectilinear slot c. The rectilinear slot e engages a pivot f provided onthe table c at one side of the grinding disk. On the pivot f is mounteda pinion g adapted to engage the teeth of a rack 7i provided on one edgeof the slot e, said pivot and pinion being carried by a block j adaptedto slide in a suitable slot in the table c. The block j is provided atone side with a rack le with which engages a worm mmountedV on a spindlen provided with a handle o by which said worm m may be rotated to moveor adjust the block j, pinion g and pivot f toward and away from thegrinding disk o. The curved slide Z is in the form of an arc struck froma center approximat-` ing in position to that of the point of the toolto be ground. Mounted and adapted to slide on the curved slide al of thelever a is a tool-box orv chuck 79 of any convenient pattern providedwith clamping means g whereby it may befclaniped in any desired positionon the slide d. The-tool-box illustrated comprises (as shown best inFig. 4) a barrel 'r mounted in a carrier s which is provided with acurved slot t engaging the slide CZ. The tool u is clamped in the barrelr by means of a lring or eye-bolt o. The barrel 7 can be rotated withinthe carrier s to allow of the tool u being turned upon its axis topresent the desired side face of the tool to the cuttingedge of thegrinding disk.

The lever d is provided with'an extension w forming a handle by which itmay be moved'.` In use the tool u to be 'ground is clamped in positionin the tool-box as indicated, and

by means of its `handle fw about the pivot` f, Y

and the tool can be vtraveled across the cutting edge byreciprocatingthe lever a on its pivot j", the pinion g of which co-acts with the rack7L ofthe slot c. The pinion g is j kept inV engagement with the rack laduring grinding by the pressure which the operatoreXerts upon the handlew of the lever a to keep the tool against the grinding disk, the pointof the tool forming the fulcrum of the lever a during grinding.

When it is desirable that the side of the tool u shall be parallel Withthe cutting edge of the disk b during grinding, the pivot can beadjusted to carrythe lever a, tool-box 77 and tool u toward or away fromthe disk b, as required, by operating the handle o to rotate the Worm mwhich co-acts with the rack 7c on the block j to move said block andpivot f toward or away from the disk Z9. A line or mark may be providedon the table c to indicate When the lever a is parallel tol the face ofthe grinding disk b, and, if desired stops may be provided to limit therotation or oscillation of the lever a. i As` the center from which thecurved slide d of the lever a is struck is approximately the point ofthe tool'u, the adjustment ofthe tool-box 70 on the curved slided'vvillnot alter the 4distance of the point of the tool from the cutting edgeof the grinding disk, but Will only alter the angle at which the tool ispresented 'to the vcutting edge..

As Will Vbe obvious, instead of providing the lever a with a curvedslide such as d, I may provide it with a curved slot With which aprojection on the tool-box Will be adapted to co-act.

Should the grinding machine to Which thetool-holder vis fitted berequired for other purposes than grinding' tools, the tool- :holder canbe readily removed from the plate c either by removing the nut andWasher which retain the leverma upon the pivot f or by sliding the block7' from the slot'in the plate c. j v y Figs. 5, Grand 7`illustra'te'amodifiediform of tool-holder in Vaccordance with my invention; In thisconstruction I vdispense With the pinion g and rack t, and firmly securethe pivot f to a horizontal pin 5 which is mounted in brackets 6, 6provided at one end of the table c. One end of the pin 5 is threaded asindicated at 7 and a ixed nut 8 co-acts With said threaded portion 7 sothat, by rotating the nut 8, the pin 5 and pivot f can bemoved towardand avvayfrom the grinding disk. This construction also permits of thelever a With itstool-box pbeing svvun'g over upon the pin 5 as on apivot'to tivo subscribing leave the grinding disk clear When this isrequired for other purposes than grinding tools. In the constructionillustrated in Figs. 5, 6 and/7, I also dispense With the spiral gearingy, 4 andconnect the spindle e to the pivot f, as shownY in Fig. 7, andprovide said spindle .e With a threaded portion 9 Vwith Which co-acts anut 10 mounted in a lug 11 on the lever a, said nut 10 beingV providedwith a handle'12 by Whichit can be rotated. As the spindles and pivot fare i incapable of motion transverselyk of the grinding disk, rotationof the nut l0 will cause the lever a With its tool-box 7J to bereciprocated transversely across the'cutting edge of the grinding disln"It will now be seen-that, by my invention, I provide a tool-holder inthe form ofa simple, light and cheap attachment to an ordinary plaingrinding machine capable of being readily adjusted to present the tooltoA the cutting edge of the grinding disk or wheel so as to insureVcorrect and eiiicient grinding, and which, moreover, can be readilyremoved from the grinding machine when the same is required for other purposes, or svvung` over to leave thefgrinding disk or Wheel clear. Y Y

What I claim and ters Patent is 1. A` tool-holder for tool-grinding ma`chines comprising a table adapted to be sup- Adesireto secure byLetported on the pan yof the grinding machine j in front of the grindingWheel, a pivot slidably mounted on the table, a .lever mounted onthe'table and adapted to be turned on thev pivot,A `means forreciprocating the lever, and a toolbox carried by said lever and adaptedto be turned about a second axis substantially parallel to the axis ofthe pivot.

2. A tool-holder-*for tool-grinding ma` chines comprising a tableadaptedto be supported on the pan 'of the grinding machine in front ofthe grinding Wheel,"a pivot slidably mounted on the table, a levermounted on the table, a'bearing on the lever adapted l to engage thepivot',rmeans for' altering the position of .the bearing With` regard tothe pivot, and a'tool box carried by 'said'. lever and adapted to ybeturned4 about a'second axis substantially parallel to the axis of'. thepivot.

In testimony whereof haveV signedmy A i name to this specification inthepresenceof witnesses.

Witnesses z HERBERT HQWARD,- GEORGE Fons'rnn.

Copies of Athis patent may be obtained for ve cents each.`by addressingthe Commissioner .of Patentst Washington, D. C. v .Y

THOMAS LUMSDEN.

